The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 10, 2012
Filed:
Apr. 06, 2011
Aqueous ink, ink jet recording method, ink cartridge, recording unit and ink jet recording apparatus
Masako Udagawa, Kawasaki, JP;
Shinichi Hakamada, Kawasaki, JP;
Takashi Imai, Kawasaki, JP;
Kenji Moribe, Fujisawa, JP;
Masako Udagawa, Kawasaki, JP;
Shinichi Hakamada, Kawasaki, JP;
Takashi Imai, Kawasaki, JP;
Kenji Moribe, Fujisawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The invention provides an aqueous ink comprising a polymer having hydroxyl groups and a pigment, which can provide images excellent in scratch resistance and highlighter resistance and can inhibit the seeping out phenomenon of the polymer and the deterioration of storage stability and ejection characteristics even when it is stored for a long period of time. The aqueous ink comprises a polymer having hydroxyl groups and a pigment, wherein a proportion of a content of a polymer that is not adsorbed on the pigment out of the polymer having hydroxyl groups to the content of the pigment in the ink is 2.0 mass % or more, and a content (mass %) of the polymer that is not adsorbed on the pigment out of the polymer having hydroxyl groups is 0.20 mass % or less based on the total mass of the ink.